10T8Y1B
VRV-W IV System Air Conditioner
4P399208-1 – 2015.01
Installation and operation manual
25
14.6. Routing and connection of power supply wiring
and transmission wiring
It is important to keep the power supply and the transmission wiring
separated from each other. In order to avoid any electrical
interference the distance between both wiring should always be at
least 50 mm.
14.6.1 General outlook
1
Power supply wiring and wiring for pump operation (High
voltage)
2
Connection wiring (Low voltage)
3
Keep separate (secure minimum distance)
14.6.2 Transmission wiring routing and connection in the
system
The transmission wiring outside the unit should be wrapped and
routed together with the field piping.
Rules for transmission wiring routing
Be sure to follow the limits below. If the unit-to-unit cables are
beyond these limits, it may result in malfunction of transmission:
- Maximum wiring length: 1000 m
- Total wiring length: 2000 m
- Maximum inter unit wiring length between outdoor units:
30 m
- Transmission wiring to cool/heat selector: 500 m
- Maximum number of branches: 16
Up to 16 branches are possible for unit-to-unit cabling. No
branching is allowed after branching (see figure below).
1
Outdoor unit
2
Indoor unit
3
Main line
4
Branch line 1
5
Branch line 2
6
Branch line 3
7
No branch is allowed after branch
8
Central user interface (etc...)
A
Transmission wiring between outdoor unit and indoor
unit(s)
B
Transmission wiring between outdoor units
Never connect the power supply to transmission wiring terminal
block. Otherwise the entire system may break down.
Never connect 400 V to the terminal block of the transmission
wiring. Doing so will break the entire system:
- The wiring from the indoor units must be connected to the F1/
F2 (In-Out) terminals on the PC board in the outdoor unit.
- After installing the transmission wires inside the unit, wrap
them along with the on-site refrigerant pipes using finishing
tape, as shown in figure below.
1
Liquid pipe
2
Gas pipe
3
Insulator
4
Transmission wiring (F1/F2)
5
Finishing tape
For the above wiring, always use vinyl cords with 0.75 to
1.25 mm
2
sheath or cables (2-core wires). (3-core wire cables
are allowable for the cooler/heater changeover user interface
only.)
1
2
3
1
1
1
A
B
2
2
2
2
2
2
8
5
6
7
7
4
3
NOTICE
Be sure to keep the power line and transmission line
apart from each other. Transmission wiring and power
supply wiring may cross, but may not run parallel.
Transmission wiring and power supply wiring may not
touch internal piping in order to avoid wire damage
due to high temperature piping.
Firmly close the lid and arrange the electrical wires so
as to prevent the lid or other parts from coming loose.
1
2
3
4
5
